M5295AP datasheet(5/8 Pages) MITSUBISHI

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ELECTRIC

MITSUBISHI

M5295AL/P/FP

MITSUBISHI<Dig.Ana.INTERFACE>

WATCHDOG TIMER

3.Relationship between Input Pulse

Width and Input Capacitance Cin

When input to pin 1 is 1.5V or more,TC pin

discharges electricity. Determine pulse width and

input capacitance Cin with reference to the diagram

shown on the right.

4.Vcc Detection Voltage Adjustment

(1)Detection voltage 1(VTH1)adjustment.

VIN

Cin

30k

20k

Q1 is off when voltage at pin 1 is 1.5V or less.

t3=Cin•5X10 •In

1.5

Vin

RST1 is output when t4 is longer than tWD.

49.6k

20.4k

1.24V

Cin:10.000pF,t3=0.6ms

Cin:1000pF,t3=0.6µs

Cin:100pF,t3=6µs

When t3 is too long,TC pin output waveform frequency

changes as shown above.Set t3 to be sufficiently long

to turn on Q1[tWDIN(3µs)or more] but not to exceed

t2(Discharge time).

(t2:Discharge time during normal input)

VTH1(V) R1(k

Ω) R2(kΩ) Detection voltage calculation formula

4.25

3.5

10.90

8.59

0.92

1.25

1.96

3.17

VTH1=

R02

R01+R02

X1.24(V)

R01=R1//49.6k

Ω

R02=R2//20.4k

Ω

To adjust detection voltage 1,determine external resistance

with the following equation:

a. VTH>4.25V(R1=10k

Ω)

b. VTH1<4.25V(R2=5k

Ω)

R2=

20.4k

R1=

49.6k

R0=

VTH1-1.24

8.322kX1.24

R0=

1.24

(VTH1-1.24)4.016k

Vin

VIN

Vin

RST1

1.5V

tWD

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